AKNH)1.D — THE PALEONTOLOGY AND STUATIGUAl'll Y OK SAN IM'.DRO. 197 



159. Melarapus olivaceus Carpenter. 



A/e/aM/>us o/ivaceus CvR., MAzat\nn Cm., No. 235: Biit Assn. Ropt., 1863, p. 647. Cooper, 71I1 

 Ann. Rept. Cal. St. Min., 18SS, p. 250. Keep, West Coast Shells, p. 124, fig. 113, 

 1S92. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. ig6. 



Shell small, thin, pyriform; spire solid, conical, barely elevated; whorls four or five, flat; 

 body- whorl comprises most of shell, slightly angnlated above; suture appressed, wavy; aperture 

 long, narrow, rounded anteriorly; outer lip thin; inner lip incrusted, and with one prominent jilica- 

 tion, and sometimes one or two more smaller ones; one prominent plication on columella; umbilicus 

 subperforate. 



Dimensions. — Long. 12 mm.; lat. 9 mm.: aperture 9.5 mm. 



Somewhat resenible.s a small, thin, depressed Conns californicits. 

 Found in all of the lower and upper San Pedro localities. Also found in (he 

 Pleistocene at Twenty-sixth Street, San Diego. 



Living. — Salinas River to Mazatlan (Cooper). 



Pleistocene. — San Diego (Cooper): San Pedro; S;in Diego (Arnold). 



Pliocene. — San Diego well (Dall). 



Superfamily PETROPHILA. 



Family XLIX. GADINIIDvE. 



Genus Gadinia Gray. 



Shell obliquely conical; muscular impression horseshoe-shaped, the right side shortest, 

 terminating at the siphonal groove. 



Gadinia nfrn Gray is a characteristic species. 



160. Gadinia reticulata Sou-erhi/. 



Mouretia reticulata Sbv., Proc. Zool. Soc. , 1S35, p. 6. 



Gadinia retiai/ala Sby., H. & A. Adams, Gen. Rec. Moll., Vol. I, p. 463, 1853. Cpr., Brit. Assn. 



Rept., 1863, p. 666. Dall, Am. Jour. Conch., Vol. VI, i87i,p. 11, PI. II, figs, i to 9; 



PI. IV, figs. I, 2 and 3. Keep, West Coast Shells, p. 98, fig. 83, 1892. Williamson, 



Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 196. 

 Rowellia sp. Cpr., Brit. Assn. Rept., 1863, p. 651. 

 Gadinia (Rowellia) radiata Cooper, Gark, Proc. Cal. Acad. Sci., Vol. Ill, 1865, p. 18S. Cooper, 



Geogr. Catal. Moll., p. 24, No. 460, 1867. 

 Rowellia radiata Cooper, Am. Jour. Conch., Vol. VI, 1871, p. 319. 

 Gadinia radiata Cooper, Dall, Am. Jour. Conch., Vol. VII, 1S72, p. 192. 

 Gadinia reticulata van radiata Cooper, Bull. No. 4, Cal. St. Min. Bureau, 1894, p. 26. 



Shell conical; apex central, smooth, blunt; surface sculptured by numerous rounded, 

 radiating ridges, made somewhat nodose by concentric, elevated lines of growth; aperture slightly 

 ovate; inner surface smooth; lip smooth, effuse; color white. 



Diinensions. — -Long. 15 mm.; lat. 14 mm.; alt. 5 mm. 



Somewhat resembles Acm(£a miira, hut is more depressed, has a less acute 

 apex, and is sculptured radially. One specimen found in upper San Pedro series of 

 San Pedro. 



